And, as you recall from high school, the Doppler Effect raises the pitch of signals from an approaching object while lowering the pitch from objects moving away...... Same deal with radio. Maybe that was Vger ringing your phone?

I also hear those things periodically, and they are always pretty strong as well.

Could it be ionospheric sounding equipment?Or perhaps some sort of over the horizon radar sounding, in prelude to activation?The periodic pattern you have observed tends to indicate some sort of man made emissions.

Alternatively, it is only a short time to December 21st, so maybe this is the first indications of E.T. returning.

Or it could just be some guy who bought an Eico 753 on Ebay and decided to hook it up to his KW linear.

If you are interested, the ELF region is full of whistlers, sweepers and lots of other naturally produced terrestrial radio signals.This is a peculiar time in the solar cycle as well - there are lots of weird signals around during geomagnetic storms and such.It is a lot of fun listening to the burps and gurgles produced naturally on H.F. during these events - Gaia with indigestion?It's easy to see the difference on long and short paths, just from these noises.

The sweep carriers you hear are most likely a product of a 2.4/5.8 GHz 802 wireless transceiver like the Motorola Canopy unit. We have several units in the neighborhood including one at my home and when the power is removed the interference stops.

I had the WISP replace the unit and the interference stopped at my home.

No, no, no. They are the high power beams of energy emitted by GRB and are sweeping the earth with gamma rays. ( Gamma Ray Bursters, a type of rapidly spinning core of a very large star after it dies,) so since we are all really just stardust ourselves, it's just mom saying hello

From reading the replies and following the links I think NM3G has the correct answer. One of the graphs shown in the link he gave covers the entire 20m band but it doesn't explain the series of signals a nominal 80 KHz apart. So far I haven't been visited by the Men in Black so I presume that there is an explanation that doesn't involve ET.

I hear these myself from time to time, and I can tell you exactly what they are not:

1. Ionosondes (aka chirpsounders)2. Any form of radar

Ionosondes sweep a given frequency range very quickly, which is why you typically just hear a chirp as it sweeps past your frequency. Any slow moving signal traversing a relatively small slice of the HF bands would have no practical value in a sounder role.

Over The Horizon Radars operating on HF also do not exhibit any of the mentioned characteristics. OTHR might hop around in frequency, but they certainly don't lazily migrate up or down in frequency and then fade out. CODAR is another form of radar using HF, but it also doesn't do what Tanakasan's signal is doing. Do some searches on Youtube--there are many examples of OTHR and CODAR signals as well as ionosondes. You can hear what they sound like and compare them to what you're hearing.

One basic but important question is whether the signal exhibits fading as any non-local signal would. If it doesn't, that's almost a dead giveaway that it's locally generated noise. And noise is almost certainly what it is.

Radiosondes for meteorological purposes are in the band 400.15 to 406 MHz, not 406 to 413.. 402 to 405 MHz is also used by the Medical Implant Communication System, while 401 to 402 and 405 to 406 is used by the Medical Equipment Data System. Much of the band is also used by the Earth Exploration Satellite Systems (EESS)

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